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Developmental retrorectal cysts presenting in adults are discussed.
Three types are identified on histologic grounds: postanal gut cysts; rectal duplications; and squamous-lined cysts. Despite differing histology and embryologic origin, all are clinically and roentgenographically similar.
Developmental cysts typically present in one of two ways. Barium enema examination may reveal a smooth mass effect on the posterior rectal wall anterior to the coccyx and lower sacrum. Alternatively, infected cysts frequently develop fistulous tracts to the rectum and to the skin between the anus and coccyx; these may be demonstrated on sinograms.
Roentgenograms may aid in differentiating developmental cysts from other mass lesions of the retrorectal space.
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